Does anyone know if this achivement requires certain skulls? For example is it possible they allow the iwhbyd skull, grunt birthday, and cowbell for instance? Could it be that easy?
It is that easy I played co op with IWHBYD, B-Day Party, and Mythic to complete the weekly challenge
Any combination of skulls will unlock the achievement.
Any three gold skulls will do for the achievement. Play the first level with Cloud, Tough Luck, and Famine. It’s really easy.
IWHBYD and grunt birthday party do count. i did it the gf 
easy peasy.